Motor starting and regulating rheostat.



UNITED STATES PATENTOFFIOE PAUL H. ZIMMER SCHENECTADY, NEW YORK, ASSIGNOR'TO GENERAL ELEOTRIO COMPANY, A CORPORATION OF NEW YORK.

MOTOR STARTING AND REGULATING RHEOST AT.

.No; 819,626. Specification of Letters Patent. Patented my 1, 1906..

Application filed mm 28, 1906. amino. 267.368.

.To all whom it concern: rocate in a bracket 11, the spring 12 forcing 5" Be it known that I, PAUL H. ZIMMER, a the end of theplunger out, so as to engage y citizen of the United States, residing at extension'l3"of the arm 6. The arm when" Schenectady, county of Schenectady, State moved to the left of the central position will 5 of New York, have invented certain new and upon being releasedreturn to that position; useful Improvements in Motor Starting and but it is free to be moved to the right over 60 Regulating Rheostats, of which the following he re lating-studs and to remain in any '6 1s-a specification. desire position upon the studs, 1 A switchs invention' relates to devioesfor co'narm 14," preferably pivoted at 7 is arranged 1o trolling motor-circuits, and has for its object so that its free end engages a clip 16. A

the provision of a device of this character in spring 17 normally, forces the switch-arm into 65 which the starting and regulating of the mo contact with the stop 18. holder to Inain-- tor may be accomplished in a simple and eflitain the switch-arm in contact with the clip, cient mannen I provide an electromagnet 19, referab y I 5 In carrying out my invention I provide, in connected across the line, althou .I .do not connection with a starting-rheostat, a series limit-my-in'vent'on to the particuIar location 7 of resistances for regulating the speed of the of this magnet. The switch-arm 14 ispromotor and a single controlling-arm to accOmvided with a pivoted armature 20, and the ,plish both'the starting and the regulation. magnet 19'byattracting'this armature holds 20 In order to accomplish this result in a simple the switch in closed posltion. I manner, I provide means whereby When the The operation of rny device is as follows: 75 running conditions of/the motor have been Before starting the motor the arm 6 is in the establishedthe arm is automatically returned central position, as shown in the drawing to "starting position, it being then left free to while the arm '14 .is in contact'with the stu be moved over the studs of the regulating re- 18, as shown in dotted lines. To start the n sistance to control the motor speed. motor, the arm 6 is moved to' the left, cutting 80 y invention further consists in the details out starting resistance 3 and at the same time of construction and in the arrangement andv carrying with it switch-arm 14 by-engaging combination of elements hereinafter 'set' the lug 14 thereon. When arm 6 reaches 3 'o forth, and particularly pointed out in the the last stud, so as to short-circuit the start:

claims annexed to and forming a part of this ing resistance, the switch-arm 14 engages the 5 application; N clip v16, 'forming,a shunt-circuit around the n the singlefigure of drawing I have reparm 6. The magnet 19, now being enerre'sented a plan view of a rheostat embodying gized, maintains 1 the switch-arm .14 in this my improvements; position. The dperator now releases the Referring to the drawing, 1 is an insulathandle 8, and the starting-arm returns to 9 ing-base of slate or soapstone provided with central position. The direction of the curthe studs'2, forming terminals of the starting rentwill then be as follows: from lead 21 to resistances 3, arranged in the arc of 'a circle pivot 7, thence through switch-arm 14, clip 40 in the usual manner, I also provide a series 16, conductor 22, to armature 23, andback to of studs 4, forming the terminals of 'a reguthe other side of the line at 24. The magnet lating resistance 5, these studs also be ar- 19 is connected to the line 24' at'25 and with ranged in the arc of a circle, preferably of a conductor '22 at 26. The current through larger diameter. A controlling-arm 6, pivthe-field passes fromvpivot 7 through arm v6 45 oted at '7 and provided withan operat1ng-' vto contact-ring-Q, thence through conductor handle 8, is adapted to be moved so that its 27 and field 28 to line 24. By moving the ee end engages the studs 4 and 2. Contactarm 6 to the right, so as to engage the studs rings. 9 and 9 form continuations, respc- 5, resistance may be cut into the field to tively, of the starting-studs 2 and the re weaken it, and thus speed up the motor, the ;o lating-studs 5, the studs themselves bemg arm being free to remain in frictional contact separated, as shown, so as to leave space for with the studs at any position. Upon failr05 the arm 6 between them. The arm 6 is ure of voltage magnet 1 9 releases the arm 14 biased to the starting position by means of a and breaks the circuit. The motor cannot spring-pressed plunger 10, mounted to reclpthen be started without repeating the operas tion above described-i. e. arm 6 must first be brought into position when the field has its greatest strength, and all of the starting resistancemust be in series with the motor.

What I claim as new, and desire to secure by Letters Patent of the United States, is

1. In a rheostat, the combination with armature and field resistances and a controllin member therefor, of means whereby. sai member is returned to the starting position of said armature resistance after running conditions have been established, and means in connection with said member for varying said field resistance.

2. In a rheostat, the combination with armature and field resistances, of a controllingarm therefor having a bias to the starting position of said armature resistance, means for closing a shunt-circuit around said arm when thelatter is moved to runnin position, and means in connection with sai arm for varying said field resistance. v

3. In a rheostat, the combination with armature and field resistances, of a controllingarm therefor having a bias to the starting position of said armature resistance, electricallycontrolled means for closing a shunt-circuit around said arm when the latter is moved to running position, and means in connection. with said arm for varying said field resistance.

4. In a rheostat, the combination with armature and field resistances, of a controllingarm therefor having a bias to the starting position of said armature resistance, a switch adapted to be closed to short-circuit said arm by the movement of the latter to running position, and means in connection with said arm for varying said field resistance.

5. In a rheostat, the combination with armature and field resistances, of a controllingtion and adapted to be closed to short-circuit said arm by the movement of the latter to running position, electrically controlled means for maintaining the closed position of said switch, and means in connection with said arm for varying said field resistance.

6. In a rheostat, the combination of a plurality of armature and field resistances and studs therefor, of a controlling-arm normally at a position between said studs and biased to the'starting position of said armature resistance, a switch biased to open position and adapted to be closed to short-circuit said arm by the movement of the latter in one direc tion to running position, and electrically-controlled means for maintaining the closed position'of said switch, said arm being free to be moved in the opposite'direction to vary said field resistance.

In witness whereof I have hereunto set my hand this 27th day of June, 1905.

PAUL H. ZIMMER.

Witnesses:

BENJAMIN B. HULL, HELEN Oaronn.

arm therefor, a switch biased to open posi- 

